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Comparaison biomécanique de trois techniques reconstructrices d’un spondylolisthésis sur un modèle rachidien de veau
Revue de chirurgie orthopédique et traumatologique (2013) 99, 50—51
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MÉMOIRE ORIGINAL
Comparaison biomécanique de trois techniques reconstructrices d’un spondylolisthésis sur un modèle rachidien de veau夽 A biomedical comparison of three spondylolysis repair techniques in a calf spine model
R. Roberto a, B. Dezfuli b,∗, C. Deuel a, S. Curtiss a, S. Hazelwood a a
Department of orthopaedic surgery, UC Davis school of medicine, Sacramento, CA, États-Unis Department of orthopaedic surgery, university of Arizona Medical Center, 1609 N. Warren avenue, Suite 110, PO Box 245064, Tucson, AZ 85724-5064, Arizona
b
Acceptation définitive le : 18 octobre 2012
KEYWORDS Spondylolysis; Biomechanical testing; Pars interarticularis; Spinal stability; Isthmus repair
Summary Summary of background data. — Previous work has demonstrated the efficacy of lumbar pedicle screw hook rod (PSHR) techniques and the Buck screw in the stabilization of spondylolysis. The mechanical behavior of lower profile cervical implants used to create PSHR, hybrid cable plate constructs, and titanium mini-plating has not previously been described. Methods. — Calf lumbar spines (L2-L6) were utilized for testing (n = 27). Intervertebral rotation was measured in the intact spines across the L4-5 segment before and after creation of bilateral pars interarticularis defects. Defects were then stabilized with one of three repair techniques, PSHR, mini-plate, or cable plate (CP) constructs (n = 9). A 5 Nm load was applied in flexion extension, lateral bending and axial rotation. Fracture displacement was measured under flexion extension and lateral bending modes. Results. — Osteotomy of the pars interarticularis increased intervertebral rotation from 4.6◦ to 9.2◦ (P < 0.05). The three techniques of repair reduced intervertebral rotation without statistical superiority of one method. In lateral bending, the mini-plate was most effective in reducing pars defect displacement (0.6 mm, P < 0.05). Although the mini-plate provided lower defect displacement in flexion extension and axial rotation, these differences were not statistically significant.
DOI de l’article original : http://dx.doi.org/10.1016/j.otsr.2012.10.011. Cet article peut être consulté in extenso dans la version anglaise de la revue Orthopaedics & Traumatology: Surgery & Research sur Science Direct (sciencedirect.com) en utilisant le DOI ci-dessus. ∗ Auteur correspondant. Tel.: +520 626 9245; fax: +520 626 2668. Adresse e-mail : [email protected] (B. Dezfuli). 夽
1877-0517/$ – see front matter © 2012 Elsevier Masson SAS. Tous droits réservés. http://dx.doi.org/10.1016/j.rcot.2012.11.012
Comparaison biomécanique de trois techniques reconstructrices d’un spondylolisthésis sur un modèle rachidien de veau 51 Conclusions. — Bilateral mini-plate fixation demonstrates superiority in restoring stability in lateral bending as compared to pedicle screw hook rod techniques and cable plate constructs. In flexion extension and axial rotation, it was as effective as a PSHR method. Consideration of anatomic plate designs warrants consideration. Level of evidence. — IV. © 2012 Elsevier Masson SAS. All rights reserved.
Disponible en ligne sur
www.sciencedirect.com
MÉMOIRE ORIGINAL
Comparaison biomécanique de trois techniques reconstructrices d’un spondylolisthésis sur un modèle rachidien de veau夽 A biomedical comparison of three spondylolysis repair techniques in a calf spine model
R. Roberto a, B. Dezfuli b,∗, C. Deuel a, S. Curtiss a, S. Hazelwood a a
Department of orthopaedic surgery, UC Davis school of medicine, Sacramento, CA, États-Unis Department of orthopaedic surgery, university of Arizona Medical Center, 1609 N. Warren avenue, Suite 110, PO Box 245064, Tucson, AZ 85724-5064, Arizona
b
Acceptation définitive le : 18 octobre 2012
KEYWORDS Spondylolysis; Biomechanical testing; Pars interarticularis; Spinal stability; Isthmus repair
Summary Summary of background data. — Previous work has demonstrated the efficacy of lumbar pedicle screw hook rod (PSHR) techniques and the Buck screw in the stabilization of spondylolysis. The mechanical behavior of lower profile cervical implants used to create PSHR, hybrid cable plate constructs, and titanium mini-plating has not previously been described. Methods. — Calf lumbar spines (L2-L6) were utilized for testing (n = 27). Intervertebral rotation was measured in the intact spines across the L4-5 segment before and after creation of bilateral pars interarticularis defects. Defects were then stabilized with one of three repair techniques, PSHR, mini-plate, or cable plate (CP) constructs (n = 9). A 5 Nm load was applied in flexion extension, lateral bending and axial rotation. Fracture displacement was measured under flexion extension and lateral bending modes. Results. — Osteotomy of the pars interarticularis increased intervertebral rotation from 4.6◦ to 9.2◦ (P < 0.05). The three techniques of repair reduced intervertebral rotation without statistical superiority of one method. In lateral bending, the mini-plate was most effective in reducing pars defect displacement (0.6 mm, P < 0.05). Although the mini-plate provided lower defect displacement in flexion extension and axial rotation, these differences were not statistically significant.
DOI de l’article original : http://dx.doi.org/10.1016/j.otsr.2012.10.011. Cet article peut être consulté in extenso dans la version anglaise de la revue Orthopaedics & Traumatology: Surgery & Research sur Science Direct (sciencedirect.com) en utilisant le DOI ci-dessus. ∗ Auteur correspondant. Tel.: +520 626 9245; fax: +520 626 2668. Adresse e-mail : [email protected] (B. Dezfuli). 夽
1877-0517/$ – see front matter © 2012 Elsevier Masson SAS. Tous droits réservés. http://dx.doi.org/10.1016/j.rcot.2012.11.012
Comparaison biomécanique de trois techniques reconstructrices d’un spondylolisthésis sur un modèle rachidien de veau 51 Conclusions. — Bilateral mini-plate fixation demonstrates superiority in restoring stability in lateral bending as compared to pedicle screw hook rod techniques and cable plate constructs. In flexion extension and axial rotation, it was as effective as a PSHR method. Consideration of anatomic plate designs warrants consideration. Level of evidence. — IV. © 2012 Elsevier Masson SAS. All rights reserved.